????????????????? "passesseseseesee thru" ???????????????
line GO THRU points
2 points...(-9,6) & (-7,1)
deltax=2, deltay=-5, slope=deltay/deltax=-5/2 =-2.5
formula: y=-2.5x+konst
projekt line from x=-7 tu x=0...deltax=7, deltay=slope*deltax=(-2.5)*7=-17.5
y=1 -17.5=-16.5
formula:y=-2.5x -16.5